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Low vibration resonant scanning unit for miniature optical display apparatus

  • US 4,902,083 A
  • Filed: 05/31/1988
  • Issued: 02/20/1990
  • Est. Priority Date: 05/31/1988
  • Status: Expired due to Term
First Claim
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1. A resonant electromechanical scanning unit comprising;

  • a base;

    a mirror;

    first spring means connecting said mirror to said base so as to allow said mirror to oscillate relative to said base, said mirror and said first spring means forming a first spring/mass system having a first mechanical resonant oscillation frequency and tranferring a first reaction force to said base;

    a counterbalance mass;

    second spring means connecting said counterbalance mass to said base so as to allow said counterbalance mass to oscillate relative to said base, said counterbalance mass and said second spring means forming a second spring/mass system having a second mechanical resonant oscillation frequency substantially equal to said first mechanical resonant oscillation frequency and transferring a second reaction force to said base; and

    driving motor means for imparting motion to at least one of said mirror and said counterbalance mass, said first spring means and said second spring means being connected to said base so that said first reaction force and said second reaction force substantially cancel each other at said base.

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